Description
When a card containing attachments is moved from one board to another, users of the target board cannot access those attachments unless they were already members of the original board.

It seems that the access permissions for attachments are not fully updated during the card transfer process. As a result, attachments remain linked to the permission structure of the source board.

Steps to reproduce

1. Create a card with one or more attachments on Board A.
2. Move the card to Board B.
3. Log in as a user who is a member of Board B, but was not a member of Board A.
4. Try to open or download the attachments.

Expected behavior
All attachments should be accessible to members of the new board (Board B) after the card has been moved.

Actual behavior
Attachments remain inaccessible to users who were not part of the original board.

Possible cause
File permissions or references may still be tied to the source board after the move, and not re-assigned to the target board’s access structure.

Environment

Wekan version: 7.93.0

Deployment: Self-hosted installation

Browser: Independent of browser (issue occurs everywhere)